Two turbo failures in 3 months
 

Hello,
3 months ago my gt2560r failed at a low pressure, All of a sudden the turbo started to make a terrible noise and the compressor wheel couldnt move freely enough. 3 days later turbo started to smoke like crazy.

Now my gt2871r has the exact same failure. The strange thing is that the failure occured during low boost again.

I run a 0.050 oil restrictor. I cannot determine if this is the problem , or an instant high egt. Something else, is it possible to fail due to boost leak?
Any ideas are welcome.

The fact that you had two identical failures make me think it must be related to the oiling system, maybe the restrictor is too small

I flirt with this idea too. My concern is that the ball bearing turbos doesnt require much amount of oil.

A boost leak may overspin it, so yes, it's possible. How bad was the leak?

I haven't figure it out yet. I had the boost controller routed to the im. When I adjusted the valve for more boost the only leak I had was from the valve. But isn't this quiet normal?

Most (maybe all?) GT turbos come with a built in restrictor. You might also have dirt getting into your feed line, clogging your restrictor and starving the turbo.

I thought it was all actually.
I thought the oil pressure sender feed comes after the filter.

Did you ever take off the CHRA?

Just out of curiosity, where are you getting the oil from, and what size line?

both real Garretts or Chinese equivalents?

I haven't heard of actual failures, but in theory, doing this will allow full boost at small throttle openings, which at high engine RPM, requires very high turbo RPMs.

The last work I did before the failure was to change a broken stud on the manifold . Had to disassemble the turbo.


I'm getting the oil from a port next to the oil filter. I'm not sure about the size of the line but you can see it in the picture.


Attachment 202198

Real Garretts.

Is that how your lines are actually routed when running? If so that may very well be your issue.

This is the gt2560r setup, but with same lines. Where do you see the problem?

I sent an email to atp and told me that if I send them my old chra they will send me a new one for 466 dollars . Has anybody done this before?

I did that with limit engineering (i think?) whom Bell said they use. It is a warranty chra replacement program. Went without a hitch.

Take some pictures of chra angle from vertical. Drain pictures also.

It looks like your oil is feeding from the side, not the top. The oil should be coming straight down into the turbo, and exiting straight down as well.

It's not on the side, the oil feed is on top of the chra, here is a more recent photo


http://a.imagehost.org/t/0208/DSC_0049.jpg

Just looks like a lot of sharp bends to me. probably not much of an issue with the feed given the pressure, I loved my 1.6 and having the feed port right there on the hot side. how/where is your drain running?

Im gonna say you dont need a restrictor with the banjo there, since they usual act as a bit of a restriction, not to mention the fact that the turbo may already have a restrictor as others pointed out

hows the drain?